Bottle stopper



FIG. 1 is a perspective view from below and to one side of a bottle stopper showing my new design;

FIG. 2 is a perspective view thereof from the same side and above;

FIG. 3 is a top view thereof;

FIG. 4 is a front elevational view thereof;

FIG. 5 is a right side view thereof;

FIG. 6 is a left side view thereof; and,

FIG. 7 is a rear elevational view thereof. 

The ornamental design for a bottle stopper, as shown and described. 